Prefabricated Frame Cast-in-Place House

Prefabricated frame cast-in-place house is a construction method for frame structures that combines the advantages of prefabrication and cast-in-place techniques. It forms an integral load-bearing system through partial prefabricated components and cast-in-place nodes, offering flexibility and efficiency, but requiring attention to seismic performance optimization.

Structural Form and Construction Characteristics

Prefabricated frame cast-in-place houses typically adopt a hybrid mode of partial prefabrication and partial cast-in-place construction. For example, columns may be prefabricated in factories and transported to the site for installation, while beams or node areas are connected using cast-in-place concrete. Alternatively, columns and beams can be prefabricated with cast-in-place joints to ensure structural integrity. This structure belongs to the frame structural system, where beams and columns are connected by steel reinforcement to form a load-bearing skeleton that resists both vertical loads (such as building self-weight and usage loads) and horizontal loads (such as wind and seismic forces).

Core Advantages

1. Spatial Flexibility and Material Efficiency
   The frame structure does not rely on walls for load-bearing, allowing for flexible spatial division to meet multifunctional building requirements. Additionally, the standardized production of prefabricated components reduces material waste, and the lighter self-weight compared to traditional brick-masonry structures lowers foundation treatment costs.
2. Improved Construction Efficiency
   Prefabricated components are manufactured in factories, ensuring quality control and shorter construction periods. Only key nodes need to be cast on-site, reducing the amount of wet work, making this method particularly suitable for projects with high construction speed requirements. For example, the Nanjing Jindi Yufang project adopted a prestressed prefabricated concrete assembled integral frame structure, significantly shortening the construction cycle.
3. Standardization and Assembly Potential
   Beams, columns, and other components are easily standardized, facilitating large-scale production and assembly-line construction, aligning with the trend of building industrialization.

Potential Challenges and Considerations

1. Node Stress Concentration Issues
   The beam-column nodes in frame structures are critical load-bearing areas. The cast-in-place sections must ensure dense steel reinforcement connections and high-quality concrete pouring to prevent cracking or failure due to stress concentration.
2. Insufficient Lateral Stiffness
   Compared to shear wall structures, frame structures have lower lateral stiffness and may experience significant horizontal displacement under strong seismic forces. Design measures such as adding shear walls, braces, or adopting ductile designs (e.g., reinforcing node reinforcement) are necessary to enhance seismic performance.
3. High Construction Precision Requirements
   The installation of prefabricated components requires strict alignment, and improper deviation control can affect structural integrity, necessitating high-precision measurement and positioning technologies.

Applicable Scenarios

This structure is suitable for multi-story to mid-rise civil buildings (such as residential and office buildings), commercial complexes, and other projects with high spatial flexibility requirements, particularly in areas with favorable foundation conditions and moderate seismic design requirements.